[StGIT PATCH] contrib/vim: Add vim syntax highlighting for StGit commit messages

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+To syntax highlight StGit commit messages in vim:
+
+ * For the current user only:
+    > mkdir -p ~/.vim/ftdetect ~/.vim/syntax
+    > cp syntax/*.vim ~/.vim/syntax/
+    > cp ftdetect/*.vim ~/.vim/ftdetect/
+
+ * For all users:
+    # cp syntax/*.vim /usr/share/vim/site/syntax/
+    # cp ftdetect/*.vim /usr/share/vim/site/ftdetect/
+

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+" Vim filetype detection plugin
+" Language:     StGit commit messages
+" Author:       Zane Bitter <zane.bitter@alliedtelesis.co.nz>
+
+
+if has("autocmd")
+
+  " Detect 'stg new' files
+  autocmd BufNewFile,BufRead .stgit-new.txt       setf     stgnew
+  autocmd BufNewFile,BufRead .stgitmsg.txt        setf     stgnew
+  " Ignore the modeline so we get type 'stgnew' instead of 'diff'
+  autocmd BufNewFile,BufRead .stgitmsg.txt        setlocal nomodeline
+
+  " Detect 'stg edit' files
+  autocmd BufNewFile,BufRead .stgit-edit.txt      setf     stgedit
+  " Use set filetype instead of setfiletype to override detection as patch
+  autocmd BufNewFile,BufRead .stgit-edit.patch    setlocal filetype=stgedit
+  autocmd BufNewFile,BufRead .stgit-edit.diff     setlocal filetype=stgedit
+  autocmd BufNewFile,BufRead .stgit-failed.patch  setlocal filetype=stgedit
+
+  " Detect 'stg squash' files
+  autocmd BufNewFile,BufRead .stgit-squash.txt    setf     stgsquash
+
+  " Detect 'stg mail' files
+  autocmd BufNewFile,BufRead .stgitmail.txt       setf     stgmail
+
+
+  " A modeline in a diff belongs to the diffed file, so ignore it
+  autocmd BufNewFile,BufRead .stgit-edit.patch    setlocal nomodeline
+  autocmd BufNewFile,BufRead .stgit-edit.diff     setlocal nomodeline
+  autocmd BufNewFile,BufRead .stgit-failed.patch  setlocal nomodeline
+  autocmd BufNewFile,BufRead .stgitmail.txt       setlocal nomodeline
+
+
+  " Set parameters on 'stg new' files to be consistent with the modeline
+  autocmd FileType           stgnew               setlocal textwidth=75
+  autocmd FileType           stgnew               setlocal nobackup
+
+  " For other stg files set textwidth the same as 'stg new'
+  autocmd FileType           stgedit              setlocal textwidth=75
+  autocmd FileType           stgmail              setlocal textwidth=75
+  autocmd FileType           stgsquash            setlocal textwidth=75
+
+endif " has("autocmd")

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+" Vim syntax file
+" Language:     StGit 'stg edit' commit message file
+" Author:       Zane Bitter <zane.bitter@alliedtelesis.co.nz>
+
+if exists("b:current_syntax")
+  finish
+endif
+
+
+runtime! syntax/mail.vim
+unlet b:current_syntax
+
+syn include @stgDiff syntax/diff.vim
+
+
+syn case match
+syn sync minlines=50
+
+
+if has("spell")
+  syn spell toplevel
+endif
+
+
+syn match    stgeditFrom        "\%^From:.*" contains=mailHeader nextgroup=stgeditFirstLine skipempty
+syn match    stgeditFirstLine   "^.\+" contained nextgroup=stgeditDiffs,stgeditComment,stgeditBlank skipnl
+syn match    stgeditSummary     "^.\{0,50\}" contained containedin=stgeditFirstLine nextgroup=stgeditOverflow contains=@Spell
+syn match    stgeditOverflow    ".*" contained contains=@Spell
+syn match    stgeditBlank       "^.\+" contained contains=@Spell
+syn match    stgeditComment     "^#.*"
+syn region   stgeditDiffs       start="^---" end="%$" contains=@stgDiff fold
+syn region   stgeditDiff        start="^\%(diff --git \)\@=" end="^\%(diff --git \|$\)\@=" contained containedin=stgeditDiffs contains=@stgDiff fold
+
+hi def link  stgeditSummary     Keyword
+hi def link  stgeditComment     Comment
+hi def link  stgeditBlank       Error
+
+
+let b:current_syntax = "stgedit"
+

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+" Vim syntax file
+" Language:     StGit 'stg mail' file
+" Author:       Zane Bitter <zane.bitter@alliedtelesis.co.nz>
+
+if exists("b:current_syntax")
+  finish
+endif
+
+
+runtime! syntax/mail.vim
+unlet b:current_syntax
+
+syn include @stgDiff syntax/diff.vim
+
+
+syn case match
+syn sync minlines=50
+
+
+if has("spell")
+  syn spell toplevel
+endif
+
+
+syn match    stgmailComment     "^#.*"
+syn region   stgmailDiffs       start="^---" end="%$" contains=@stgDiff fold
+syn region   stgmailDiff        start="^\%(diff --git \)\@=" end="^\%(diff --git \|$\)\@=" contained containedin=stgmailDiffs contains=@stgDiff fold
+
+hi def link  stgmailComment     Comment
+
+
+let b:current_syntax = "stgmail"
+

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+" Vim syntax file
+" Language:     StGit 'stg new' commit message file
+" Author:       Zane Bitter <zane.bitter@alliedtelesis.co.nz>
+
+if exists("b:current_syntax")
+  finish
+endif
+
+
+syn case match
+syn sync minlines=50
+
+
+if has("spell")
+  syn spell toplevel
+endif
+
+
+syn match    stgnewFirstLine    "\%^.*" nextgroup=stgnewSTG,stgnewComment,stgnewBlank skipnl
+syn match    stgnewSummary      "^.\{0,50\}" contained containedin=stgnewFirstLine nextgroup=stgnewOverflow contains=@Spell
+syn match    stgnewOverflow     ".*" contained contains=@Spell
+syn match    stgnewBlank        "^.\+" contained contains=@Spell
+syn match    stgnewSTG          "^STG:.*"
+syn match    stgnewComment      "^#.*"
+
+hi def link  stgnewSummary      Keyword
+hi def link  stgnewComment      Comment
+hi def link  stgnewSTG          Comment
+hi def link  stgnewBlank        Error
+
+
+let b:current_syntax = "stgnew"
+

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+" Vim syntax file
+" Language:     StGit 'stg squash' commit message file
+" Author:       Zane Bitter <zane.bitter@alliedtelesis.co.nz>
+
+if exists("b:current_syntax")
+  finish
+endif
+
+
+syn case match
+syn sync minlines=50
+
+
+if has("spell")
+  syn spell toplevel
+endif
+
+
+syn match    stgsqFirstLine     "\%^.*" nextgroup=stgsqComment,stgsqContext,stgsqBlank skipnl
+syn match    stgsqSummary       "^.\{0,50\}" contained containedin=stgsqFirstLine nextgroup=stgsqOverflow contains=@Spell
+syn match    stgsqOverflow      ".*" contained contains=@Spell
+syn match    stgsqBlank         "^.\+" contained contains=@Spell
+syn match    stgsqSeparator     "-\+$" contained
+syn region   stgsqPatch         start="^\(.\{66\}-\{4\}$\)\@=" end="\(^.\{66\}-\{4\}$\)\@=" contained containedin=stgsqContext contains=@Spell fold
+syn match    stgsqNextPatch     "^.\{66\}-\{4\}$" contained containedin=stgsqPatch contains=stgsqPatchName
+syn match    stgsqPatchName     "^.\{-\}\(-*$\)\@=" contained containedin=stgsqNextPatch nextgroup=stgsqSeparator
+syn region   stgsqContext       start="^---" end="%$" contains=@Spell fold
+syn match    stgsqComment       "^#.*"
+
+hi def link  stgsqSummary       Keyword
+hi def link  stgsqComment       Comment
+hi def link  stgsqBlank         Error
+hi def link  stgsqContext       Comment
+hi def link  stgsqPatch         Constant
+hi def link  stgsqPatchName     Identifier
+hi def link  stgsqSeparator     Comment
+
+
+let b:current_syntax = "stgsquash"
+